Scrappy vs Scrap
To my mind,
A "scrappy" quilt has many different fabrics in it, but the fabrics are (usually) more or less coordinated and the layout is planned.
A "scrap" quilt is literally made from left-overs, odds and ends, and may or may not look coordinated or planned. It will usually end up being a "utilitarian" quilt rather than a "showpiece."
What are your opinions about the two descriptions? Or are the words interchangeable to you?